chore: replace EvoSync with ЭВОСИНК throughout UI

Update all page titles and branding in FastAPI app and templates to use Russian transliteration of product name.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/templates/confirm_email.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}Подтверждение email — EvoSync{% endblock %}
+{% block title %}Подтверждение email — ЭВОСИНК{% endblock %}
 
 {% block content %}
 <div class="row justify-content-center">